CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Turbulent Intesity Inlet and outlet cavitating flow in Nozzle

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   April 28, 2015, 12:29
Default Turbulent Intesity Inlet and outlet cavitating flow in Nozzle
  #1
Member
 
Quang Le Dang
Join Date: Jun 2012
Posts: 61
Rep Power: 7
SPH_CFD is on a distinguished road
Dear all,

I have a problem with cavitating flow inside nozzle.
I have a convergent-divergent Nozzle with length=600 mm and diameter=50mm, pressure inlet =171000 Pa and outlet=109200 Pa. working fluid is water with temperature =373.3 K.

My problem is that I use K-Omega solver and I do not have experience to set Turbulent intensity bcs (both inlet and outlet).

Do you have experience about this value (or range of this value). Please let me know.

Thanks in advance
SPH_CFD is offline   Reply With Quote

Old   April 29, 2015, 03:54
Default
  #2
New Member
 
jiri kozak
Join Date: Jan 2013
Posts: 21
Rep Power: 6
Kozan is on a distinguished road
Hello, I'm solving similar case right now. It is C-D nozzle with diameter of 0.053 m on the inlet and 0.02 m in the narrowest part. (2D, axisymmetric, RSM, S-S model of cavitation, transient, BC: Vel. in., pres. out.). My work is focused on the dynamics of the cavitating flow.

I'm not very familiar with K-Omega model of turbulence, but I heard that its implementation in the Fluent isn't the best and realizable k-eps should produce better results (but I'm not sure about that). Anyway there is some calculator for the values you need.

You can find it here: http://www.cfd-online.com/Tools/turbulence.php
There is some documentation too, so maybe it will be useful for you.

If you want to share some experience, please feel free to write me a pm maybe it could be useful for both of us.

Good luck and have a nice day
Kozan is offline   Reply With Quote

Old   April 29, 2015, 08:51
Default
  #3
Member
 
Quang Le Dang
Join Date: Jun 2012
Posts: 61
Rep Power: 7
SPH_CFD is on a distinguished road
Dear Kozan,

Thank you so much for your help
I have realized that we simulate on the same model. However, I try 3D nozzle. I also try 2D and it is very simple to converge.
Could you please share with me some information about your input output? of some test cases. I just want to be sure that FLUENT can do this thing.
SPH_CFD is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Issues on the simulation of high-speed compressible flow within turbomachinery dowlee OpenFOAM Running, Solving & CFD 8 October 25, 2016 19:48
Want Impeller Driven Fluid Flow: What Inlet and Outlet BC to use for Centrifugal Pump Zev Xavier FLUENT 3 May 9, 2016 06:42
ATTENTION! Reliability problems in CFX 5.7 Joseph CFX 14 April 20, 2010 15:45
steam flow in a pipe driven by a pressure gradient between inlet and outlet SalvoCalvo Main CFD Forum 0 March 11, 2010 07:52
compressible flow in a counterflow nozzle d.vamsidhar FLUENT 0 November 24, 2005 02:45


All times are GMT -4. The time now is 15:29.